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xen/hvc: Fix error cases around HVM_PARAM_CONSOLE_PFN 

We weren't resetting the parameter to be passed in to a
known default. Nor were we checking the return value of
hvm_get_parameter.

CC: stable@kernel.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-05-23 12:55:38 -04:00
parent 2e5ad6b9c4
commit a32c88b938
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/hvc/hvc_xen.c
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@ -219,7 +219,8 @@ static int xen_hvm_console_init(void)
if (r < 0)
goto err;
info->evtchn = v;
hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
v = 0;
r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
if (r < 0)
goto err;
mfn = v;